call_reestablishment.ladder
Change-Id: I4da8b8b37a874975f4eb1e633bc114e606b27f1e
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@ -75,3 +75,5 @@ doc/manuals/common
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doc/manuals/build
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contrib/osmo-msc.spec
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doc/sequence_charts/call_reestablishment.msc
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@ -0,0 +1,36 @@
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{hscale=2}
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ms = MS
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cell1 = Cell 1 (BTS+BSC)
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cell0 = Cell 0 (BTS+BSC)
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msc = MSC
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ms () msc Call Re-Establishment
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ms [] msc Ongoing voice call: MM is established
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...
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ms ->< cell0 radio link fails
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ms ><- cell0
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msc <> . Keep MM until timeout
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ms -> cell1 Channel Required
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ms <- cell1 Immediate Assignment
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ms -> cell1 Complete Layer3
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cell1 -> msc Complete Layer3:
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CM Re-Establishment Request
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cell0 <- msc Clear Command
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cell0 -> msc Clear Complete
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cell1 <- msc Authentication Request
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cell1 -> msc Authentication Response
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cell1 <- msc Cipher Mode Commad
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cell1 -> msc Cipher Mode Complete
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cell1 <- msc Assignment Request
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this Assignment ACKs the CM Re-Establishment
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ms <- cell1 RR Assignment Command
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ms -> cell1 RR Assignment Complete
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cell1 -> msc Assignment Complete
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